<div class="refentry"><a id="glClampColor"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>glGetFragDataLocation — query the bindings of color numbers to user-defined varying out variables</p></div><div class="refsynopsisdiv"><h2>C Specification</h2><div class="funcsynopsis"><table class="funcprototype-table" style="cellspacing: 0; cellpadding: 0;"><tr><td><code class="funcdef">GLint <strong class="fsfunc">glGetFragDataLocation</strong>(</code></td><td>GLuint <var class="pdparam">program</var>, </td></tr><tr><td> </td><td>const char * <var class="pdparam">name</var><code>)</code>;</td></tr></table><div class="funcprototype-spacer"> </div></div></div><div class="refsect1"><a id="parameters"></a><h2>Parameters</h2><div class="variablelist"><dl class="variablelist"><dt><span class="term"><em class="parameter"><code>program</code></em></span></dt><dd><p>
                    The name of the program containing varying out variable whose binding to query
                </p></dd><dt><span class="term"><em class="parameter"><code>name</code></em></span></dt><dd><p>
                    The name of the user-defined varying out variable whose binding to query
                </p></dd></dl></div></div><div class="refsect1"><a id="description"></a><h2>Description</h2><p>
            <code class="function">glGetFragDataLocation</code> retrieves the assigned color number binding for the user-defined
            varying out variable <em class="parameter"><code>name</code></em> for program <em class="parameter"><code>program</code></em>. <em class="parameter"><code>program</code></em>
            must have previously been linked. <em class="parameter"><code>name</code></em> must be a null-terminated string. If <em class="parameter"><code>name</code></em>
            is not the name of an active user-defined varying out fragment shader variable within <em class="parameter"><code>program</code></em>, -1 will
            be returned.
        </p></div><div class="refsect1"><a id="errors"></a><h2>Errors</h2><p>
            <code class="constant">GL_INVALID_OPERATION</code> is generated if <em class="parameter"><code>program</code></em> is not the name of a program object.
        </p></div>
        {$pipelinestall}{$examples}
        <div class="refsect1"><a id="seealso"></a><h2>See Also</h2><p>
            <a class="citerefentry" href="glCreateProgram"><span class="citerefentry"><span class="refentrytitle">glCreateProgram</span></span></a>,
            <a class="citerefentry" href="glBindFragDataLocation"><span class="citerefentry"><span class="refentrytitle">glBindFragDataLocation</span></span></a>
        </p></div><div class="refsect1"><div id="Copyright"><h2>Copyright</h2><p>
            Copyright © 2010 Khronos Group.
            This material may be distributed subject to the terms and conditions set forth in
            the Open Publication License, v 1.0, 8 June 1999.
            <a class="ulink" href="https://opencontent.org/openpub/" target="_top">https://opencontent.org/openpub/</a>.
        </p></div></div></div>
